US7670010B2 - System and method for projector lamp safety interlock - Google Patents
System and method for projector lamp safety interlock Download PDFInfo
- Publication number
- US7670010B2 US7670010B2 US11/533,872 US53387206A US7670010B2 US 7670010 B2 US7670010 B2 US 7670010B2 US 53387206 A US53387206 A US 53387206A US 7670010 B2 US7670010 B2 US 7670010B2
- Authority
- US
- United States
- Prior art keywords
- lamp
- ballast
- connector
- interlock
- projector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
- 238000000034 method Methods 0.000 title claims description 15
- 238000003780 insertion Methods 0.000 claims abstract description 10
- 230000037431 insertion Effects 0.000 claims abstract description 10
- 230000000007 visual effect Effects 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 5
- 229910052736 halogen Inorganic materials 0.000 claims 1
- 150000002367 halogens Chemical class 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 230000035939 shock Effects 0.000 abstract description 6
- 238000005286 illumination Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000013500 data storage Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 229910052987 metal hydride Inorganic materials 0.000 description 2
- 150000004681 metal hydrides Chemical class 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2046—Positional adjustment of light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2086—Security or safety means in lamp houses
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2921—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
Definitions
- the present invention relates in general to the field of information handling system projector displays, and more particularly to a system and method for a projector lamp safety interlock.
- An information handling system generally processes, compiles, stores, and/or communicates information or data for business, personal, or other purposes thereby allowing users to take advantage of the value of the information.
- information handling systems may also vary regarding what information is handled, how the information is handled, how much information is processed, stored, or communicated, and how quickly and efficiently the information may be processed, stored, or communicated.
- the variations in information handling systems allow for information handling systems to be general or configured for a specific user or specific use such as financial transaction processing, airline reservations, enterprise data storage, or global communications.
- information handling systems may include a variety of hardware and software components that may be configured to process, store, and communicate information and may include one or more computer systems, data storage systems, and networking systems.
- Information handling systems typically present visual images through a peripheral display device. With information handling systems finding increasing use as entertainment tools, such as for watching movies or playing games, high quality display presentations have become of greater interest to end users. Display devices with relatively high resolution are generally able present larger images while maintaining good visual quality.
- a high resolution display that presents a high quality image is the projector.
- Projectors receive visual information from information handling systems through standardized interfaces, such as through a DVI or VGA cable, and generate images with an internal transparent device, such as a liquid crystal display. A high intensity light is passed through the transparent device and focused at a point distal from the projector to present the image.
- high pressure mercury lamps are often used in projectors to provide an intense and bright light source to illuminate the visual image. Projector lamps are periodically replaced as their brightness intensity diminishes with use.
- the lamp is integrated in a housing sized to fit into a cavity of the projector so that lamps are changed by releasing an existing housing and inserting a new housing.
- One difficulty with projectors is that the mercury lamps typically needed to get a quality visual presentation operate at high voltage levels.
- the voltage levels are generated with ballast electronics that connect to the lamp through the lamp housing. These high voltage levels present a hazard to end users when a lamp housing is changed if the end user forgets to disconnect power to the projector before changing the lamp.
- Some projectors include a safety mechanism that turns off power to the lamp ballast electronics if a projector housing door that encloses the lamp is opened. For example, a switch connected to the projector housing door deactivates power to the ballast if the projector housing door opens to expose the lamp.
- such safety systems can make a projector unusable in the event of damage to the projector housing door or to the safety switch. Over time, physical devices having moving parts are more apt to fail than electronic devices without moving parts. Further, the projector has to include wiring and programming to apply switch activation to the ballast power, all of which are subject to failure.
- a safety interlock breaks a ballast supply circuit unless ballast connectors that provide high voltage power to a projector lamp are not exposed or otherwise presenting a shock hazard.
- an information handling system has plural processing components to generate visual information for presentation as visual images by a display device, such as a projector.
- the visual information is communicated to processing components of a projector, which generates a visual image at a device, such as an LCD, disposed between a lamp and a lens.
- the projector lamp illuminates the image with high intensity light to project the image through the lens to a display surface, such as with a metal hydride lamp that operates with high voltage provided by a lamp ballast.
- a safety interlock disposed in a ballast power supply circuit breaks the circuit unless the lamp is sufficiently inserted into the projector to prevent exposure of the ballast and lamp high voltage connectors.
- the safety interlock completes the circuit when the lamp is inserted a predetermined distance sufficient to prevent exposure of the high voltage ballast connectors.
- the predetermined distance e.g., before exposure of the ballast connectors
- power is removed from the ballast so that further withdrawal of the lamp from the projector will not expose “hot” ballast connectors.
- the present invention provides a number of important technical advantages.
- One example of an important technical advantage is that power is automatically removed from a projector lamp ballast during change of the projector lamp. Removal of the lamp housing automatically removes ballast power before the lamp ballast connector is exposed, thus removing the risk of an electrical shock.
- the interlock that remove ballast power has no moving parts and is integrated in the lamp housing for replacement each time the lamp is replaced. Since the interlock directly connects and disconnects power to the lamp ballast, safety from electrical shock is ensured without additional wiring or programming to minimize potential points of failure.
- FIG. 1 depicts a block diagram of an information handling system and projector operable to present visual information as visual images
- FIG. 2 depicts a block diagram of a projector lamp safety interlock system.
- an information handling system may include any instrumentality or aggregate of instrumentalities operable to compute, classify, process, transmit, receive, retrieve, originate, switch, store, display, manifest, detect, record, reproduce, handle, or utilize any form of information, intelligence, or data for business, scientific, control, or other purposes.
- an information handling system may be a personal computer, a network storage device, or any other suitable device and may vary in size, shape, performance, functionality, and price.
- the information handling system may include random access memory (RAM), one or more processing resources such as a central processing unit (CPU) or hardware or software control logic, ROM, and/or other types of nonvolatile memory. Additional components of the information handling system may include one or more disk drives, one or more network ports for communicating with external devices as well as various input and output (I/O) devices, such as a keyboard, a mouse, and a video display. The information handling system may also include one or more buses operable to transmit communications between the various hardware components.
- RAM random access memory
- processing resources such as a central processing unit (CPU) or hardware or software control logic
- ROM read-only memory
- Additional components of the information handling system may include one or more disk drives, one or more network ports for communicating with external devices as well as various input and output (I/O) devices, such as a keyboard, a mouse, and a video display.
- I/O input and output
- the information handling system may also include one or more buses operable to transmit communications between the various hardware components.
- FIG. 1 a block diagram depicts an information handling system 10 and projector 12 operable to present visual information as visual images.
- Information handling system 10 generates visual information with a plurality of processing components, such as CPU 14 , RAM 16 , a hard disk drive 18 , and a chipset 20 .
- CPU 14 runs an application stored on hard disk drive 18 that generates visual information using RAM 16 and chipset 20 .
- Chipset 20 includes graphics components that format the visual information for presentation by a display and communicates the formatted visual information to projector 12 through an external cable 22 , such as DVI cable.
- Projector 12 includes a video processor 24 that applies the visual information to set pixel values in an LCD 26 so that a visual image is created corresponding to the visual information.
- the visual image is presented at a distal surface by focusing light from a lamp 28 through a lens 30 .
- a lamp 28 is selected that provides powerful illumination, such as a metal hydride lamp.
- a high alternating current (AC) voltage is required, such as 25,000 volts.
- An external AC power source 32 is provided to a power supply 34 to generate a direct current (DC) voltage for operating components of projector 12 .
- the DC voltage is provided to a ballast 36 through a ballast supply circuit 38 for generation of AC voltage to operate lamp 28 .
- the ballast voltage is communicated through ballast connectors 40 that connect when a lamp housing 42 containing lamp 28 is inserted into a lamp housing cavity 44 formed in projector 12 .
- safety interlock connectors 46 break ballast supply circuit 38 until lamp housing 42 is sufficiently inserted to avoid exposure of ballast connectors 40 .
- Lamp housing 42 is formed so that insertion into cavity 44 is prevented unless ballast connectors 40 and safety interlock connectors 46 are aligned, such as by having opposing grooves formed in opposing sides of cavity 44 and lamp housing 42 .
- FIG. 2 a block diagram depicts a projector lamp safety interlock system 48 .
- Lamp housing 42 contains lamp 28 and a high voltage lamp connector 50 aligned to connect with a high voltage supply connector 52 when lamp housing 42 is inserted into a projector along an insertion axis 54 .
- Connectors 50 and 52 engage during insertion so that high voltage provided from ballast 36 is not exposed once lamp housing 42 is inserted a predetermined distance, as illustrated by the dotted lines.
- Safety interlock 48 has opposing low voltage interlock connector 54 and low voltage supply connector 56 aligned to complete ballast supply circuit 38 as lamp housing 42 is fully inserted into a projector.
- safety interlock 48 does not complete ballast supply circuit 38 until connectors 50 and 52 are sufficiently coupled to prevent exposure of high voltage provided by ballast 36 .
- safety interlock 48 breaks ballast supply circuit 38 before lamp housing 42 moves a predetermined distance at which ballast connectors 50 and 52 are exposed.
- power is removed from ballast 36 to remove the risk of electrical shock before ballast connectors 50 and 52 are exposed.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims (12)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/533,872 US7670010B2 (en) | 2006-09-21 | 2006-09-21 | System and method for projector lamp safety interlock |
SG200706851-3A SG141354A1 (en) | 2006-09-21 | 2007-09-19 | System and method for projector lamp safety interlock |
CN200720177389.2U CN201145815Y (en) | 2006-09-21 | 2007-09-20 | Safety interlocking system for projector lamp |
TW096215822U TWM338379U (en) | 2006-09-21 | 2007-09-20 | Information handling system and projector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/533,872 US7670010B2 (en) | 2006-09-21 | 2006-09-21 | System and method for projector lamp safety interlock |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/272,502 Continuation US7805397B2 (en) | 2002-11-05 | 2008-11-17 | Intelligent data management system and method |
Publications (2)
Publication Number | Publication Date |
---|---|
US20080074622A1 US20080074622A1 (en) | 2008-03-27 |
US7670010B2 true US7670010B2 (en) | 2010-03-02 |
Family
ID=39224567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/533,872 Active 2028-09-21 US7670010B2 (en) | 2006-09-21 | 2006-09-21 | System and method for projector lamp safety interlock |
Country Status (4)
Country | Link |
---|---|
US (1) | US7670010B2 (en) |
CN (1) | CN201145815Y (en) |
SG (1) | SG141354A1 (en) |
TW (1) | TWM338379U (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080170208A1 (en) * | 2007-01-11 | 2008-07-17 | Seiko Epson Corporation | Light source device, lighting device, monitoring device, and projector |
US20130182229A1 (en) * | 2012-01-17 | 2013-07-18 | Panasonic Corporation | Projection type image display apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008276067A (en) * | 2007-05-02 | 2008-11-13 | Canon Inc | Video display device and its control method |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5241242A (en) | 1991-05-29 | 1993-08-31 | Hella Kg Hueck & Co. | Power-supply circuit apparatus for high pressure gas discharge lamps in motor vehicles |
US5855488A (en) | 1997-09-19 | 1999-01-05 | In Focus Systems, Inc. | Protection lamp safety interconnect apparatus and method |
US20010038520A1 (en) * | 2000-04-06 | 2001-11-08 | Shigeki Yagi | Portable X-ray fluorescence analyzer |
US6402346B1 (en) * | 1999-06-10 | 2002-06-11 | Compaq Computer Corporation | Easy-heat-dissipation spotlight structure |
US6424097B1 (en) | 2000-05-12 | 2002-07-23 | Infocus Corporation | Projection lamp safety interlock apparatus and method |
US20020168287A1 (en) * | 2001-03-27 | 2002-11-14 | Richard Eckhardt | Method and apparatus for rapidly sterilizing irregularly-shaped objects |
US20040057019A1 (en) * | 2002-09-13 | 2004-03-25 | Kirill Sokolov | Color switching projection apparatus with two liquid crystal panels |
US6802615B2 (en) * | 2002-05-16 | 2004-10-12 | Nec Viewtechnology, Ltd. | Projector and lamp information management method used for the same |
US7175288B2 (en) * | 2003-07-04 | 2007-02-13 | Benq Corporation | Projector |
EP1770431A2 (en) | 1997-01-16 | 2007-04-04 | Carl Zeiss AG | Spectacle lens comprising spherical front side and multi-focal back side and method for its production |
US20070075647A1 (en) * | 2005-09-30 | 2007-04-05 | Christie Digital Systems, Inc. | Method and apparatus for storing lamp data |
-
2006
- 2006-09-21 US US11/533,872 patent/US7670010B2/en active Active
-
2007
- 2007-09-19 SG SG200706851-3A patent/SG141354A1/en unknown
- 2007-09-20 TW TW096215822U patent/TWM338379U/en not_active IP Right Cessation
- 2007-09-20 CN CN200720177389.2U patent/CN201145815Y/en not_active Expired - Lifetime
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5241242A (en) | 1991-05-29 | 1993-08-31 | Hella Kg Hueck & Co. | Power-supply circuit apparatus for high pressure gas discharge lamps in motor vehicles |
EP1770431A2 (en) | 1997-01-16 | 2007-04-04 | Carl Zeiss AG | Spectacle lens comprising spherical front side and multi-focal back side and method for its production |
US5855488A (en) | 1997-09-19 | 1999-01-05 | In Focus Systems, Inc. | Protection lamp safety interconnect apparatus and method |
US6402346B1 (en) * | 1999-06-10 | 2002-06-11 | Compaq Computer Corporation | Easy-heat-dissipation spotlight structure |
US20010038520A1 (en) * | 2000-04-06 | 2001-11-08 | Shigeki Yagi | Portable X-ray fluorescence analyzer |
US6424097B1 (en) | 2000-05-12 | 2002-07-23 | Infocus Corporation | Projection lamp safety interlock apparatus and method |
US6853152B2 (en) | 2000-05-12 | 2005-02-08 | Infocus Corporation | Electric power supply safety interlock system |
US20020168287A1 (en) * | 2001-03-27 | 2002-11-14 | Richard Eckhardt | Method and apparatus for rapidly sterilizing irregularly-shaped objects |
US6802615B2 (en) * | 2002-05-16 | 2004-10-12 | Nec Viewtechnology, Ltd. | Projector and lamp information management method used for the same |
US20040057019A1 (en) * | 2002-09-13 | 2004-03-25 | Kirill Sokolov | Color switching projection apparatus with two liquid crystal panels |
US7175288B2 (en) * | 2003-07-04 | 2007-02-13 | Benq Corporation | Projector |
US20070075647A1 (en) * | 2005-09-30 | 2007-04-05 | Christie Digital Systems, Inc. | Method and apparatus for storing lamp data |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080170208A1 (en) * | 2007-01-11 | 2008-07-17 | Seiko Epson Corporation | Light source device, lighting device, monitoring device, and projector |
US7722226B2 (en) * | 2007-01-11 | 2010-05-25 | Seiko Epson Corporation | Light source device, lighting device, monitoring device, and projector |
US20130182229A1 (en) * | 2012-01-17 | 2013-07-18 | Panasonic Corporation | Projection type image display apparatus |
Also Published As
Publication number | Publication date |
---|---|
CN201145815Y (en) | 2008-11-05 |
SG141354A1 (en) | 2008-04-28 |
TWM338379U (en) | 2008-08-11 |
US20080074622A1 (en) | 2008-03-27 |
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Legal Events
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AS | Assignment |
Owner name: DELL PRODUCTS L.P., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JAYARAM, SUBRAMANIAN;D'ALESSIO, SAMUEL NICKLAUS;REEL/FRAME:018284/0318 Effective date: 20060921 Owner name: DELL PRODUCTS L.P.,TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JAYARAM, SUBRAMANIAN;D'ALESSIO, SAMUEL NICKLAUS;REEL/FRAME:018284/0318 Effective date: 20060921 |
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Owner name: BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS FIRST LIEN COLLATERAL AGENT, TEXAS Free format text: PATENT SECURITY AGREEMENT (NOTES);ASSIGNORS:APPASSURE SOFTWARE, INC.;ASAP SOFTWARE EXPRESS, INC.;BOOMI, INC.;AND OTHERS;REEL/FRAME:031897/0348 Effective date: 20131029 Owner name: BANK OF AMERICA, N.A., AS COLLATERAL AGENT, NORTH CAROLINA Free format text: PATENT SECURITY AGREEMENT (TERM LOAN);ASSIGNORS:DELL INC.;APPASSURE SOFTWARE, INC.;ASAP SOFTWARE EXPRESS, INC.;AND OTHERS;REEL/FRAME:031899/0261 Effective date: 20131029 Owner name: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT, TEXAS Free format text: PATENT SECURITY AGREEMENT (ABL);ASSIGNORS:DELL INC.;APPASSURE SOFTWARE, INC.;ASAP SOFTWARE EXPRESS, INC.;AND OTHERS;REEL/FRAME:031898/0001 Effective date: 20131029 Owner name: BANK OF AMERICA, N.A., AS COLLATERAL AGENT, NORTH Free format text: PATENT SECURITY AGREEMENT (TERM LOAN);ASSIGNORS:DELL INC.;APPASSURE SOFTWARE, INC.;ASAP SOFTWARE EXPRESS, INC.;AND OTHERS;REEL/FRAME:031899/0261 Effective date: 20131029 Owner name: BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS FI Free format text: PATENT SECURITY AGREEMENT (NOTES);ASSIGNORS:APPASSURE SOFTWARE, INC.;ASAP SOFTWARE EXPRESS, INC.;BOOMI, INC.;AND OTHERS;REEL/FRAME:031897/0348 Effective date: 20131029 Owner name: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT, TE Free format text: PATENT SECURITY AGREEMENT (ABL);ASSIGNORS:DELL INC.;APPASSURE SOFTWARE, INC.;ASAP SOFTWARE EXPRESS, INC.;AND OTHERS;REEL/FRAME:031898/0001 Effective date: 20131029 |
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